Brock's rise from battling for a roster spot in training camp to starting corner for one of the best defenses in the NFL has been impressive. After surpassing Nnamdi Asomugha on the Niners' depth chart, Brock intercepted a Matt Schaub pass for a pick six to cement his place as the team's nickel cornerback.

Brock, an undrafted free agent out of Belhaven College, has a team-high four interceptions on the season for the 49ers.